I normally don't particularly like the ripsaw tracks, but the 1.75 ripsaw looks a lot better to me than the shorter lugged versions. The 1.75x146 could definitely be used and it would probably be very nice. You would, however, have to change your drivers to 2.86 pitch. You can order it ALL from tracksusa.com. The only thing you really need to be concerned about is that with the 146" track, the back wheels need to be situated a whole inch further back than with a 144". If you're doing the conversion, then be sure that what you do will give you enough space.
The other option I would suggest is the Arctic cat 144x1.25 track part number 1602-191, which is a 1.25x144 PREDATOR track. Camoplast used to sell it direct with the part number 9873 (if I recall correctly), and it will perform very well both on and off trail.
The other options are less than stellar. Ripsaw is very delicate, and the lugs on cobra (and other 144" crossover tracks) are very thin. The only other 144" track that gives me the impression of being fairly durable is the freeride, only problem is that its only 14" wide. It will work though.